Parenting a teenager can cause one to think a little more about free will. You can be constantly trying to judge how much freedom to give them, knowing full well that in not too long they will be totally responsible for themselves. They need to learn gradually.

And really, they are not a lot of help with that sort of decision, wanting total freedom one minute and then security and no responsibility the next. Maybe I exaggerate a little but parenting is full of hard decisions....